#! /usr/bin/python
# coding: utf-8

from Tkinter import *

root = Tk()

v = StringVar()

lb = Listbox(root, listvariable=v)
for item in range(10):
    lb.insert(END, str(item*100))

print v.get()
v.set(('1000', '200'))

lb.pack()
root.mainloop()
